Malicious PDF — malware analysis report

Static analysis result for SHA-256 314fac8667fde036…

MALICIOUS

PDF

69.6 KB Created: 2021-04-06 09:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e00292a8e9230e3cc09085d0b395df28 SHA-1: 043ec2bcb19a2dd5f6f693f35cebf4f6a2be894e SHA-256: 314fac8667fde036aabd1587554de4fa5535a2fe2c20b6e9a59396ed9d19420c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to 'https://pelibifir.ru/123?utm_term=english+guide+for+2nd+puc', suggesting a phishing or content-luring attack. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' further supports the idea that the document is designed to redirect users to a network of malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/123?utm_term=english+guide+for+2nd+puc PDF link annotation
    • http://nabuxusamabola.iblogger.org/36684000281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467601/normal_605f3739e4a29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_6008c110f29c5.pdfIn PDF document text
    • https://kexiwiwimibip.weebly.com/uploads/1/3/1/3/131379584/c82303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_6047b2e735f73.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/sibefarepazupok-bimavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_60604cdf08cd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavodokebak.rf.gd/85578568017.pdfIn PDF document text
    • http://jiminoxesovibin.epizy.com/encyclopaedia_eorzea_english.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/jozedetim.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/banoso.pdfIn PDF document text
    • http://puwogufipuja.epizy.com/80690940260.pdfIn PDF document text
    • http://bixobetagosap.epizy.com/26776005134.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/dell_optiplex_9020_sff_i7-4790.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/aprendizajes_clave_para_la_educacin_integral_educacion_primaria_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/41493346882.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/divina_commedia_longfellow.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/66321189153.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/cubist_pharmaceuticals_annual_report.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 5296 bytes
SHA-256: 13d75c769b3526e40f7c7a2eeae7021b33444872245e43ee83e7d474d706b8a2
font_01_sfnt_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 10792 bytes
SHA-256: 22db507498ec38560b1c700e9d4ed845b4f3cdad61064ebe94eb16ec48008f1c

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